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Messages - DaveB

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1006
Gear Talk / Building a Thorn Nomad
« on: January 20, 2007, 05:12:14 pm »
XTR should make a great touring group if the expense isn't an issue.  

Using a 44T big chainring and an 11xXX cassette will give you a 108 gear-inch high gear which is identical to a 52x13 so that should be more than adequate unless you insist on pedaling down big hills.  

You will also have a very low low gear either 22x32 (18.5 gear-inches) or 22x34 (17.4 gear-inches)depending on the cassette you choose which should get you up anything!

Summary, XTR will cover about any conditions you are likely to face.

The Grand Canyon area is at 7500' at the South Rim and about 8500' at the North rim so the altitude makes it feel harder.  And, while the climbs aren't real steep, they can be very long.  


1007
Gear Talk / Building a Thorn Nomad
« on: January 20, 2007, 03:00:38 pm »
What kind of terrain do you expect top ride on and how heavy will your loads be on tour?  

If you are only going to ride in moderate hills and carry a modest load, a road triple such as Shimano Ultegra or what ever Campy now calls their top Triple group with a 12x27 or 13x29 cassette should do fine.  

If you are going to carry massive loads up big mountains than an MTB group such as Shimano XT with a MTB crank and something like a 11x32 or 11x34 cassette will likely work better. You will need a road front derailleur if you mate the MTB stuff with STI shifters.  Barcons will shift anything in front.


1008
Gear Talk / Advice-buying a Cannondale'Touring Classic' ?
« on: January 11, 2007, 10:52:33 pm »
I believe Cannondale doesn't sell any model called the Touring Classic in the US and it may be a name used for a European and/or UK/Irish model.  If you can get the specifications for the Touring Classic from your bike dealer you could compare them with the Cannondale US web site's description of the T2000.



 


1009
Gear Talk / does anyone use a rolhoff speedhub on their tourer
« on: January 06, 2007, 01:15:56 pm »
Looks like an incredible bit of engineering. Super expensive, I would guess.

Yep, you could say so.  Sheldon Brown's web site lists them for $950 to $1200 depending on the model.  Remember, this cost is ONLY for the hub, the rest of the bike isn't included.:)

One downside to the Rohloffs is the twist-type shifter is intended for straight bars only.  I've heard of homemade adapters to allow it to be used on drop bars but they seem crude and awkward.



1010
Gear Talk / Touring computer
« on: December 24, 2006, 08:09:27 pm »
I use and like CatEye wired computers.  Enduro or Mity.  $20-25.

We certainly agree on this.  I have Cat-Eye Mity and Enduro cyclocomputers (same computer but a heavier gauge wire) on six of my own bikes and friends and family have them on a dozen more.  They've been ultra reliable and the batteries last for years.  Very good choice.


1011
Gear Talk / cannondale
« on: December 24, 2006, 08:05:09 pm »
the only thing was a questions was finding bike shops that would service canndondales,...

I don't understand this at all.  Bikes aren't like cars with engines, transmissions, etc. unique to a particular make.  Except for the frames, bikes all use the same components made by one of two or three mamufacturers (with the VAST majority being by Shimano) and every shop has seen them all.  ANY shop can work on almost ANY bike.  


1012
Gear Talk / Suspension seat posts
« on: December 16, 2006, 05:55:00 pm »
I can't recommend a specific post but I do know the saddle isn't included.  All you get is the post.  


1013
Gear Talk / STI shifters with XT crank?
« on: December 07, 2006, 12:48:19 pm »
I was told each front derailleur works best with only the size big chainring it was designed for. An Ultegra designed for a 52 tooth ring will have problems with a smaller mtn 44 big ring and vice versa.

Theoretically this is true but in reality a road fd intended for a 52 or 53T large ring will work OK with a 44/46 big ring.  The shifting won't be the very best but you probably won't notice the minor difference.  

Years ago Shimano had the RSX triple group that came with 46/36/26 chainrings and an RX-100 road fd meant for a 52T chainring.  It shifted fine with that "mismatched" combination.  

You probably can't use an MTB front derailleur satisfactorily with a road crank since the cage radius is too tight and the fd would have to sit too far above the chainring to clear it properly.  


1014
Gear Talk / STI shifters with XT crank?
« on: December 01, 2006, 05:03:38 pm »
No, the XTR front derailleur is not likely to work with road STI shifters,  The geometry and cable pull for MTB derailleurs and shifters are different from those for road derailleurs andn shifters.  You will need a road fd to work with  STI's.  You can use the XTR crank with a road fd.  


1015
Gear Talk / 10 speed cassettes for touring
« on: December 15, 2006, 01:58:04 pm »
Most touring bikes have lower gears than road and sport bikes.

That, in and of itself, is a problem.  Low gears put much higher loads on a chain than tall gears. Look at the lever arms, a 42T chainring puts half the load on a chain that a 21T does at the same pressure on the crank. MTB's break chains as a result of their extremely low gears, 20x34 is common, not just wear from abrasive riding conditions.  

Compounding the problem is the extra luggage weight (20 to 50+ pounds) on the bike and you have tourists putting significantly more demands on their chains than regular road riders.      


1016
Gear Talk / 10 speed cassettes for touring
« on: December 07, 2006, 12:54:18 pm »
One other potential problem with 10-speed is that the chains are even narrower than the already thin 9-speed chains.  The chain could be the (pun unavoidable) "weak link" in the system.  

10-speed has proven adequately strong for road and sport bike use but I wonder if it will tolerate the demands of loaded touring.  I think that is the reason MTB's have never gone to 10-speed.


1017
Gear Talk / 10 speed cassettes for touring
« on: November 24, 2006, 09:13:49 pm »
The only problem will be that "10-speed" rear derailleurs are exclusively road derailleurs and are rated to handle a 27T (Shimano) or 29T (Campy) maximum rear cog.  This max can be exceeded by a little but I don't think any of them will tolerate a 32T cog and certainly not a 34T.

You will have to use an MTB rear derailleur to allow use of these cassettes.  They will be marketed as 9-speed derailleurs but that won't matter.


1018
Gear Talk / heron frames
« on: November 24, 2006, 09:08:34 pm »
Anyone have other suggestions for a light,sporty touring frame?

Light and  sporty usually don't go together with touring but check out the Co-Motion Nor'Wester or Nor'Wester Tour.  They are reasonably light Reynolds 853 frames set up for light to middle-weight touring.  Very well made too.  



1019
Gear Talk / Child Carrier for Cargo
« on: November 20, 2006, 06:41:26 am »
I've not done it myself but I've seen several tourists using a child trailer as a cargo trailer.  I don't see why not.  The downside is that they are wider and have more wind resistance than a BOB but, otherwise, should be very suitable.  

You could probably improve the aerodynamics a bit by removing the overhead canopy and using a more compact waterproof covering since you won't have to protect a child from the rain or sun.  


1020
Gear Talk / Thermarest pad slipping
« on: November 03, 2006, 07:33:18 pm »
You must have an older Thermarest (like mine). I think the newer ones have a surface treatment to solve just that problem.  


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